Pencil



W. E; COOK ET AL PENcL Filed Aug. 8. 1922 May ze, 1925.

.ZNvE/vofzs. W/ LL/AM, E. COOK. MARCUS /Y//CKEL SEN. .BY y//m-g .f Mm Az-TORNEYS.

Patented May 26, 1925.

UNITED STATES PATENT OFFICE.

PENCIL.

Application led August 8, 1922. Serial No. 580,501.

T 0 all 107mm t may concern:

Be it known that we, WILLIAM E; Coon and MARCUS MICKELSEN, citizens of the United States, residing at Minneapo-lis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Pencils, of which the following is a specification.

Our invention relates to pencils, and an object is to provide improved lead-feeding mechanism within an outer casing which may be easily manipulated and which may be detached from said outer casing and used repeatedly without danger of getting out of order. A particular object is to provide a device of this character embodying a leadfeeding plunger provided with an off-set portion near one end -thereof which exteriorly engages one of the convolutions of al rotatable helical spring-like member and interiorly engages the two convolutions which are at each side of this convolution, so that a three-point bearing for the oifset portion o-f the plunger is provided. Another object is to provide a pencil of this character which lcan be economically and readily manufac- I 'tured from metals of various kinds.

v The full objects and advantages of our invention will be obvious from the foregoing description, and the novel features embodied in our inventive idea will be particularly pointed out in the claims.

In the accompanying drawings, Fig. 1 is a view of our pencil onv an enlarged scale taken in longitudinal section and showing the plunger in rearward or retracted position. Fig. 2 is a view partly in elevation and partly in longitudinal'section showing the plunger in forward position. Fig. 3 is an elevational view in which the outer casing has been removed so that a fresh lead may be inserted. Fig. 4 is a view in elevation of the entire pencil drawn to natural size. Fig. 5 is a view in section on the line 5-5 of Fig. 1. Fig. 6 is a detail view of the lead-holding chuck secured to lthe forward end of the feeding plunger. Fig. 7 is a. fragmentary view showing a slightly modified manner of fastening a coiled spring which constitutes part of the feeding mechanism. l

As shown in the drawings, we'provide an outer tubular casing 10 having a contracted lower end12. Secured at an intermediate position within the casing 10 is an interiorly screw-threaded ring 14 adapted to have screw-threaded engagement with an exteriorly threaded ring or portion 16 carried by an inner tubular Vmember having fau upperl portion 18 which fits snugly within an exterior barrel portion of the pencil and having a lower contracted-portion 20, the lower end 22 of which is still furthereontracted to fit within thecontracted lower end 12 of the outer casing. The portionv 18 adjacent the ring 16 is provided with a shoulder 24 which engages the upper end of the ring 14 when the parts are 'screwed together.

which, at its lower end, is contractedv to form a projection 28 upon which is secured the closely coiled end portion-30'of a helical coiled spring 32 which extends downinto the contracted portion 20. This latter portion is provided with a longitudinal `slot 34 which slidably receives the offset portion 36 ofa plunger 38 extending axially within the portion 20'. The offset portion 36 is de-v flected outside of one of the convolutions of the spring member 32 and this 'member engages the inside of the tw'o adjacent vconvolutions so lthat the offset portion of the plunger hasthree bearing points as indicated at a, b, and e. Secured to the lower portion of the plunger 38 is a chuck o-r leadholding member 40 which receives the upper larged at 46 to form a shoulder which rests against the upper end of the vmember 18. A cap 48 is adapted to frictionally fit luponV the enlargement 46 and rest against the upper end of ya thumb band 5.0 secured to the member 18 near the upper end thereof. An eraser 52 may be held in the ,upper end of the member 26. In the mo Rotatably mounted within the tubular portion 18 is a tubular member 26 ifieation of the mechanism one end of `a fresh lead may be readily inserted in the chuck 40. The plunger 38 at this time will be retracted as shown in Figs. 1 and-"B-so tha-t'the olset portion 36 will be disposed toward the upper end. of the springmember 32. `The outer= casing is then replaced by screwing the ring 16 into the ring .14..and the engagement ofV the band 50 with the end of the casing 10 will `secu-rely hold'theparts together. As

the lead is I used I up,I thejcap 14 is gripped v and turned in thewproper direction, 'thereby Yrotating theHmember'QG inside the'member 18. 'Therotation tothe right of the member 26frotates the helical spring 32,thereby causingl the plunger and the lead held at the forward 'endl thereof to 'be' fed forwardly.y

"Theit'hree-point engagement ofthe oii'iset y toi theirfproper shape.

portion of the vlunger insures a reliable feeding oftlfie'` p linger, andvin caseany of the convolnt-ions off-the'coiled spring should become4 distorted, will tend to restore4 them peneili comprising an outer casing, anl'-inte'rinediate tubular! memberpmeans for d vdetachably" securing ysaid` tubn'lar memberf withinjfsaid casing, an inner tubular 1ne,1n

ber :rotatably v mounted within rthe upper portion of said intermediate f member, la helicalfspring secured tofthelower end of said tubular member and extending with lin thefl'ower portionofesaid intermediate Vmember,a plunger extending: axially .-witliin said intermediate member l and having angoflfset. portion which is sli'dable in a slot Y inl/said intermediate Ymember-and which exteriorlywengages 35a convolution of saidy spfrinfg andint'eriorly engages convolutions ateach Lsidey ofv'sai'd-first mentioned convo i lxly secured'rotatably withinthe upper por-` lut'ion7 andaN lead-hold-ingjcliiick secured Sto thelower en d ovfsadplungerlf vi2. 'pencil comprising an outer` casing,

Van intermediate tubular-member, means for detachably. securing, said A tubular member within said-casing, the upper portion of said. tubular `mem e lower portionwof saidttubular -mei'nberbe` ingrcontractedgan inner tubular member` rotatably mounted `within the upper .portion of .said intermediate member, afhelical Vspring secu-redu to the llower end Vof said infV ner tubular membeinfand extending within the lower portionrof said intermediatemem-v Y d fitting snugly: within the upper-portion of said casing" and the portion which is slidable in a 'slot in said intermediate member and which exteriorly engages a convolution of said spring and interiorly engages convolutions at each side of saidrst convolution, ,anda'lea'd-holding'cliuck securedE to the lower end of said plunger.

.- 3..Atpenci1 comprising an outer casing,

`an interiorly `threaded ring secured withinV Said casing intermediate the ends thereof,

a tubular member, the upper portion of which fits snugly within the upper portion member, a helical spring lseeureot to the lower end of said innertubular member and extending'within said contractedpor-V tion of the/first ,mentioned:tubular-mein@ ber, a plunger withinfsaidcontracted portion -and'phaving an offset upper end po'r` tion which* is slidable in raslot in said confV tracted portion and :whieh-yexteriorly en-l gagesla convolutionofsaid spring and iiiteriorly engages convolutions at, each lside of: said lfirst* convolution, and 'a lead-holding chuck securedr to u the lower. end ofnsaid plunger LA 'pencil comprising fan outer casing,l'

an intermediate tubular member, means for detachably securing said intermediate tu? bular memberv andcasingtogether interme-A diate tlie'ends. thereofg'the upper *portion of said intermediate'tubular.member Lttirig;

snugly! within the upper portion of said casing andfextending beyond' the latter, a 1 band secured'toi-said extended portion and engagingithewupper end .of said. outer casing, an inner tubular member Vlongitudinaltion 'of fsad` intermediate tubular. member,

andlead-feeding' means Vattac-hed 'to the lower endof said inner Imember. -I

5. =A pencil. comprisingan' outer f casing, an intermediate tubulanmember, means for i detachablywseouring; said tubulainmember within said outer casing, an inner. tubular member rotatably mounted within lthe 'up-' 1 per portion: of said intermediate member and longitudinally fixed therein, a helical spring secured' -to the-lower end of said tu- Y ,bular member and extend-ing Within the lowerfportion-k off said Vintermediate member, aplunger; extending axially within said intermediate member and having Van' oiiset zportion which isslidable, inv aslot nsaid intermediate member and which exteriorly engages a convolution of said spring and interiorly engages convolutions at. each side otl said tirst mentioned convolution, and a lead-holding chuck secured to the lowei endl of said plunger.

6. A pencil comprising an outer casing, an intermediate tubular member, means for detachably securing said tubular member within said outer casing, the upper portion ot' said intermediate tubular member titting snugly within the upper portion ot said lower portion of said outer casing, an inner tubular member longitudinally secured and rotatably mounted within the upper portion ot' said intermediate tubular member, a helical spring secured to the lower end ot said tubular member and extending within the lower portion of said intermediate member, a plunger extending axially within said intermediate member and having an otl'set portion which is slidable in a slot in said intermediate member and which exteriorly engages a convolution of said helical spring and interiorly engages convolutions at each side of said first convolution, and a leadholding chuck secured to the lower end of said plunger.

7. A pencil comprising an outer casing, an interiorly threaded ring secured within said casing intermediate the ends thereof, a tubular member, the upper portion of which tits snugly within the upper portion 'of said outer casing, and the lower portion of which is contracted and has a tapered and apertured end that tits within said outer casing, the upper end of said contracted portion having an exteriorly threaded portion for engagement with said interiorly threaded ring, a band secured to the extended portion of said tubular member and engaging the upper end of said outer casing, an inner tubular member longitudinally secured and rotatably mounted within the upper portion oit said tirst mentioned tubulai member and extending within said contracted portion of the first mentioned tubular member, a plunger within said cont'acted portion having an oliset upper end portion which is slidable in a slot in said contracted portion and which ex'tcriorly engages a convolution of said spring and interiorly engages convolutions at each side ot said lirst convolution, and a lead-holding chuck secured to the end of said plunger.

8. A pencil comprising an outer tubular casing having a tapered and apertured end, a removable casing secured therein having a tapered and apertured end contracting the said tapered end of the outer casing, a tubular casing longitudinally tixed and rotatable in said second mentioned casing and extending to an intermediate point therein, a helical member secured to the inner end ot the last mentioned casing, a lead-holder having a part engaging said helical member and disposed in and held from rotation by said second mentioned casing and adapted' to be moved inwardly and outwardly ot' said tapered apertured ends by rotation ot said last mentioned casing.

9. A pencil comprising an outer casing having a tapered and apertured end, an interiorly threaded ring secured within said casing intermediate the ends thereof, a removable intermediate tubular vmember having a tapei'ed and apertured end contact-ing the said tapered end of the outer casing, said tubular member being contracted at a point intermediate the ends thereof, an exteriorly threaded iing on the upper end ot said contracted portion for engagement with said interiorly threaded ring, a shoulder on the external end ot said tubular member for engagement with the upper end of said outer casing, a tubular casing longitudinally secured and rotatable in said intermediate member and extending to a point intermediate the ends thereof, a helical member secured to the inner end of said tubular member, and a lead-holder having an offset portion which is slidable in a slot in said intermediate member and which exteriorly engages a convolution of said member and engages convolutions at each side of said lirst mentioned convolution.

10. A pencil comprising an outer casing, an intermediate tubular member, means for detachably securing said tubular member within said casing, an inner tubular member rotatably mounted within the upper p0rtion of said intermediate member, a helical spring secured to the lower end ot said tubular member and extending within the lower portion of said intermediate member, a plunger extending axially within said intermediate member and having an odset portion which is slidable in a slot in said intermediate member and which exteriorly engages a convolution ot said spring and interiorly engages convolutions at each side of said lirst mentioned convolution.

11. A pencil comprising an outer casing contracted at the tip and extending from end to end ot the pencil, a tubular member, the upper portion of which tits snugly within the upper portion of said outer casing and the lower portion of which is contracted to tit within the contracted portion of said outer casing, and lead-feeding mechanism within said tubular member, said outer casing and tubular member having threaded engagement with each other substantially midway ot their ends.

12. A pencil comprising an outer casing contracted at the tip, a tubular member the upper portion of which fits snugly within the upper portion of said outer casing Whereby a zchamberl of substantially the diameter ofthe pencil is provided at the upper portion of the pencil, the lower portion of said tubular member being contracted to fit Within rthe contracted portion of said outer casing and lead feeding lmechanism Within said tubular member. f

r13. A pencil comprising an outer casing contracted at the tip,r a tubular member, the upper portion of lwhich tits snugly Within thel upper portion of said outer casing and the lower portion of which is contracted to it Within the contracted portion of said -outer casing,a lead-feeding plunger Within said tubular member, means for operating said plunger, and a cylindrical lead-holding chuck attached to the lower end of said plunger adapted to engagethe contracted lar memberv and having an offset portion whlch is slidable in said longitudinal slot` and which exteriorly engages aconvolution of said spring and in-teriorlyengages `adjacentvconvolutions of said spring at each side of said first mentioned convolution.

`In testimony lwhereof .We hereunto affix our signatures. f Y

WILLIAM E. COOK. i .MARCUS yMICKELSEVN. 

